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Source: Glenigan | Last updated: 1st October 2026
The top construction company in Wales is CRH with projects valued at £175,000,000.
2nd place - Morgan Sindall Group with projects valued at £166,000,000.
3rd place - Kier Group with projects valued at £104,000,000.
The Top 100 construction company league table shows you the top contractors working across the UK and outlines the number of projects and the total value of them. Giving you the insight to contact new opportunities and win more business.
The top construction companies league table is determined by an extensive research process. We use market leading technology, exclusive data, and ongoing media scanning to get sight of UK construction projects. Our team of 160 dedicated researchers then validate this data by making over 1 million phone calls a year and receiving 30,000 real-time information updates each day. This rigorous research process ensures quality and reliability. Making it the most accurate and up-to-date construction data available.
Built on the most accurate and up-to-date construction data available, our league table data allows you to see which construction companies are winning the most work, which construction projects are the most valuable, and which are open for tender.
This insight allows you to identify and contact new construction opportunities, allowing you to win more business and succeed in your market.
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